[redis] several deployment methods of redis

stand-alone

advantage ：

Simple deployment

shortcoming ：

Performance is limited by the performance of a single server , Difficult to expand horizontally , Poor disaster tolerance

Master slave synchronization

What is it? ：

Master slave synchronization is a master node , Multiple slave Node and slave Nodes can also have slave node

There are two ways of master-slave synchronization ： Full synchronization and incremental synchronization

• Full amount of synchronization ：master Generate RDB issue slave,slave Load write
• The incremental synchronization ：master Every data operation is synchronized to slave

advantage ：

Master slave synchronization allows master Responsible for writing operations ,slave Responsible for reading operation , The performance is better than that of a single machine

shortcoming ：

Performance is affected by a single master Limit , Not easy to expand horizontally , Poor disaster tolerance , Cannot be highly available

Sentinel mechanism

What is it? ：

One master, Multiple slave, Each node is monitored by the sentinel process , The sentry checks every once in a while master Whether the connection is lost , If you lose the connection , Other sentinels also check master Whether the connection is lost , If more than half of the Sentinels check master Lose connection ,master Offline , from slave Choose one of them to become a new master. If it is slave Lose connection , be slave Offline .

advantage ：

High availability , Strong disaster tolerance

shortcoming ：

Performance is still affected by individual master Limit , Not easy to expand horizontally

colony

What is it? ：

Multiple master, Multiple slave, Sentinels can be used .

The data is based on crc-16 Algorithm will key hash 16383 individual slot, Different master Responsible for different data .

advantage ：

Strong performance , Easy to expand , High availability , Strong disaster tolerance

shortcoming ：

Complex deployment , The high cost